A major security feature is our push notifications for every account transaction. So, if something odd is going on, you're in the picture right away. You can, of course, immediately change your card pin in the app or lock your card. Otherwise, you can of course contact our support. Important changes in the app, and transfers, must be authorised with a TAN authentication. Online payment with our debit card is secured by MasterCard via 3D-Secure.